If you already have a file with georeferencing info in it which can be made
into a geogrid, then geogrid.writeFile() (or its replacement in 4.0
NetcdfCFWriter) can be used. If you are writing the file from scratch, then you
need to use a metadata convention, and we recommend CF:
Anthony Fox wrote:
Hello,
I am trying to create a NetCDF file with a GeoGrid. My data is a
200x200 grid indexed by latitude and longitude. Each grid point has a
"prediction" value that is a double ranging from 0 to 1. Can I create
a NetCDF file from this data? I have tried the code following but ran
into trouble trying add a coordinate system. Any help in creating a
NetCDF file from this data set would be appreciated.
Thanks,
Anthony
NetcdfFileWriteable ncfile = NetcdfFileWriteable.createNew(
"mypredfile");
// add dimensions
Dimension latDim = ncfile.addDimension("lat", 200);
Dimension lonDim = ncfile.addDimension("lon", 200);
ArrayList<Dimension> dims = new ArrayList<Dimension>();
dims.add(latDim);
dims.add(lonDim);
ncfile.addVariable("prediction", DataType.DOUBLE, dims);
Variable predvar = new Variable(ncfile, ncfile.getRootGroup(),
null, "prediction");
predvar.setDataType(DataType.DOUBLE);
predvar.setDimensions(dims);
VariableDS predVariable = new
VariableDS(ncfile.getRootGroup(), predvar, true);
// ???????????????????????
// predVariable.addCoordinateSystem(new
CoordinateSystem(ncfile, arg1, arg2));
ncfile.create();
ArrayDouble preds = new ArrayDouble.D2(latDim.getLength(), lonDim.
getLength());
Random rand = new Random();
for (int i = 0; i < latDim.getLength(); i++) {
for (int j = 0; j < lonDim.getLength(); j++) {
preds.setDouble(preds.getIndex().set(i, j), rand.nextDouble());
}
}
ncfile.write("prediction", new int[2], preds);
ncfile.close();
/* IS THIS CORRECT?????
GridDataset gd = new ucar.nc2.dt.grid.GridDataset(NetcdfDataset.
openDataset("mypred"));
GeoGrid grid = new GeoGrid(gd, new
VariableDS(ncfile.getRootGroup(), ncfile.getVariables().
get(0), true), new GridCoordSys(null, null));
ncfile.create();
grid.writeFile("mypredwithgrid");
*/
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